docs: add UniFi AP Outdoor+ to list of supported devices

docs/index.rst

@@ -151,6 +151,7 @@ ar71xx-generic
   - UniFi AP
   - UniFi AP Pro
   - UniFi AP Outdoor
+  - UniFi AP Outdoor+
 
 * Western Digital
 

docs/releases/v2016.1.rst

@@ -30,6 +30,7 @@ ar71xx-generic
 
   - airGateway
   - airRouter
+  - UniFi AP Outdoor+
 
 * Western Digital